#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int my_strlen(char* arr)
{
	if (*arr != '\0')
		return 1 + my_strlen(arr + 1);
	else
		return 0;
}

int main()
{
	char arr[20] = "1234567890";

	printf("%d ", my_strlen(arr));
	return 0;
}